Molding method for laminated body using cooling air

ABSTRACT

In a method and molding apparatus for laminated molded bodies, a thermal-molding felt and a thermoplastic resin sheet, respectively in hot and soft condition, are set or placed on a mold face of cold-pressing-molding lower mold. A cold-pressing-molding upper mold lowers onto the lower mold to press the the thermal-molding felt and thermoplastic resin sheet. Simultaneously, cooling air is supplied to center portion of the thermal-molding felt through a blowing pipe protruding from mold face of the thermal-molding felt side and intruding into the felt accelerating circulation of cooling air and cooling of the thermoplastic resin sheet.

This application is a divisional application of prior application Ser.No. 08/699,853, filed Aug. 20, 1996 now U.S. Pat. No. 5,840,149 which isin turn a continuation of Ser. No. 08/245,114, filed May 17, 1994 nowabandoned.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a molding method and a moldingapparatus for a laminated molded body such as insulator dashboards ofcars.

2. Description of the Prior Art

Ordinarily, an insulator dashboard having sound insulation function isinstalled on a dashboard panel facing a car interior, with the dashboardpanel placed in front of the driver seat and the passenger seat of acar. The dashboard panel is made of a laminated molded body of a soundinsulation material such as a thermoplastic resin sheet and a soundabsorption material such as felt and polyurethane foam.

Conventional molding method for the insulator dashboard will beexplained on the basis of the drawings of FIG. 19 and FIG. 20.

First, sound absorbing material is heated to 165 to 175° C. measured atits surface through a hot blast heating furnace, the hot material isshaped to its desired shape by cold pressing step and the soundabsorption material shaped is cooled, and the material is molded to itsprecise shape of the dashboard.

Next, as shown in FIG. 19, the sound absorption material 1 of desiredshape is set on a lower mold 3 for cold-pressing-molding, and a soundinsulating material 2 heated to 130 through 135° C. measured at itssurface is placed on the sound absorbing material 1. Acold-pressing-molding upper mold 4 having substantially the same shapeor profile as that of the cold-pressing-molding lower mold 3 is placedabove the lower mold 3.

Next, as shown in FIG. 20, the cold pressing molding upper mold 4 islowered, a pressing pressure of 15 to 30 kg/cm² is applied between thelower mold 3 and the upper mold 4 for in order to mold the soundabsorbing material 1 and the sound insulation material 2, apredetermined cooling period is elapsed, a second pressing (pressure:100 to 150 kg/cm²) is done in order to trim or cut the circumference orthe outer periphery of the product by means of trimming blade 8 providedaround the circumference of the cold-pressing-molding upper mold 4.

Then, a water-jet cutting device or special purpose mold is used tocarry out a trimming or piecing the process completing the molding ofproducts.

According to the conventional molding method for insulator dashboards,after the sound absorbing material 1 is shaped in a desired shape bymeans of a press mold, a different press mold is used to press the soundinsulation material 2 and the sound absorbing material 1, so that it isnecessary to employ two steps of pressing and to prepare plural moldinstallations.

In addition, it has been difficult to control the pressure level inpressing of the sound insulation material 2 and the sound absorbingmaterial 1. When the pressure level is too high, the sound absorbingmaterial 1 may be crushed the resulting in failure of obtainingappropriate thickness of the product. On the contrary, if pressure levelis too weak, one of the sound insulation material 2 and the soundabsorbing material 1 may be peeled from other one.

Still, according to the prior art, the elasticity of the soundabsorption material 1 prevents the pressing pressure from beingappropriately transferred to the sound insulation material 2, making itdifficult to precisely or sharply shape the of corners of the product.

Additionally, the sound absorbing material 1 is typically made of athermal-molded felt having thermal insulation quality. Thus, it takes along time to cool the molded sound absorbing material 1, requiring alonger molding cycle.

SUMMARY OF THE INVENTION

The present invention relates to a forming and molding method of alaminated product of a laminated bodies formed of a sound insulatingmaterial made of thermoplastic resin sheet and a sound absorbingmaterial made of a thermal-molding felt. The method comprises the stepsof mounting the thermal-molding felt and the thermoplastic resin sheetin a heated and soft state on a lower mold for cold pressing andmolding, lowering an upper mold for cold pressing and molding onto thelower mold, pressing and molding the thermoplastic resin sheet and thethermal-molding felt integrally with a predetermined clearance leftbetween the upper mold and the lower mold for cold pressing and molding,and supplying cooling air into the thermal-molding felt through pressedair holes in order to accelerate the molding process of thethermoplastic resin sheet and the cooling process of the thermal-moldingfelt.

Also, the present invention relates to the forming and molding method oflaminated products or laminated molded bodies according to claim 1,wherein the sound insulating material is made contact with a mold faceof the thermoplastic resin sheet side through a vacuum suction holeformed in a mold at the thermoplastic resin sheet side.

Still also, the present invention relates to the molding method oflaminated products wherein air is blown through a blowing pipe providedwith a front end protruded from the mold face of thermal-molding feltside and intruded in the thermal-molding felt in order to help mold thesound insulation material and simultaneously forcibly cool thethermal-molding felt.

Still also, the present invention relates to the molding method oflaminated product according to claim 1, wherein air supplied in thethermal-molding felt through the blowing pipe is exhausted from acircumferential portion, and simultaneously exhausted to the outsidethrough vacuum suction holes provided at suitable locations of the moldface at the thermal-molding felt side.

Still also, the present invention relates to the molding method of alaminated product of a laminated body formed of a sound insulationmaterial made of a thermoplastic resin sheet and a sound absorbingmaterial made of a thermal-molding felt. The method comprises the stepsof preheating the cold-pressing-molding molds and the materials, settingand mounting the thermoplastic resin sheet and the thermal-molding feltin the heated and soft condition on the lower mold for cold pressing andmolding, lowering the upper mold for cold pressing and molding, pressingintegrally the thermoplastic resin sheet and thermal-molding felt with apredetermined clearance left between the upper mold and the lower moldfor cold pressing and molding, sealing the circumference with a sealmember, supplying cooling air in the thermal-molding felt from aplurality of air supply ports provided in the upper mold forcold-pressing-molding, applying predetermined face pressure to thethermoplastic resin sheet in order to press and mold the soundinsulation layer and the sound absorbing layer, raising the upper moldfor cold-pressing-molding in order to cancel sealed condition of thecircumference of the upper mold and the lower mold forcold-pressing-molding, and supplying cooling air in the sound absorbinglayer through air supply ports or holes in order to forcibly cool thesound absorbing layer.

Still also, a molding apparatus for a laminated molded body of thepresent invention consists of a cold-pressing-molding lower moldprovided with a predetermined mold face and a cold-pressing-moldingupper mold placed above the lower mold in order to press and mold thethermal-molding felt in a predetermined shape, wherein one of thesemolds for cold-pressing-molding has pressure air holes acceleratecooling of the thermal-molding felt.

Still also, the molding apparatus for a laminated molded body accordingto claim 6 has vacuum suction holes provided in the other mold forcold-pressing-molding in order to vacuum-mold the thermoplastic resinsheet.

Still also, the molding apparatus for laminated molded bodies accordingto claim 1 has a blowing pipe provided in other mold forcold-pressing-molding, and a front end of the blowing pipes protrudeupwardly from the mold face and adapted to insert in the thermal-moldingfelt when the laminated molded body is pressed.

Still also, the molding apparatus for laminated molded bodies accordingto claim 1 has vacuum suction holes provided with the other mold forcold pressing and molding in order to exhaust air supplied from theblowing pipe.

Still also, the molding apparatus for laminated molded bodies accordingto claims 3 and 5 has a blowing pipe provided with a plurality ofsupplemental holes formed on the side wall of the blowing pipe in orderto forcibly cool the thermal-molding felt.

Still also, the molding apparatus for a laminated molded body consistsof a lower mold for cold-pressing-molding having desired molding face orprofile and an upper mold for cold-pressing-molding movable up-and-downdirection and placed above the lower mold in order to press and mold thethermoplastic resin sheet and the thermal-molding felt in apredetermined shape, wherein a trimming blade having a sealing functionand a trimming function is provided on the circumference of the uppermold for cold-pressing-molding.

Consequently, it is a first purpose of the present invention to providea molding method of laminated molded body to shorten very much moldingtime by accelerating the molding process of the thermoplastic resinsheet and the cooling process of a laminated molded body.

Still also, it is a second purpose of the present invention to provide amolding method of laminated molded body enabling to shortenmanufacturing process, simplify the mold installation and shorten thecooling cycle period resulting in the laminated molded body of goodmoldability.

Still also, it is a third purpose of the present invention to provide amolding apparatus of laminated molded body enabling to shorten very muchthe molding time by hastening the molding time of thermoplastic resinsheet and the cooling time of the thermal-molding felt.

Still also, it is a fourth purpose of the present invention to provide amolding apparatus enabling to simplify the mold installation and improvethe moldability.

Characteristics of the present invention will be made more apparent byreading the following description described with reference to theaccompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a section of a car insulator dashboard manufactured by themolding method of the present invention.

FIG. 2 is a section of molding apparatus according to a first embodimentof the present invention and the materials set.

FIG. 3 is a section showing a pressing step of the molding methodaccording to the present invention.

FIG. 4 is a section showing a cooling step for the sound absorbingmaterial in the molding method of the present invention.

FIG. 5 is a section depicting structure of the molding apparatusaccording to the second embodiment of the present invention.

FIG. 6 is a section showing a heating step for the thermoplasticsynthetic resin sheet according to the molding method of the presentinvention.

FIG. 7 is a section showing the heating step for the thermal-moldingfelt according to the molding method of the present invention.

FIG. 8 is a section depicting a material setting step of the moldingmethod of the present invention.

FIG. 9 is a section depicting a pressing step according to the moldingmethod of the present invention.

FIG. 10 is a section showing a vacuum air and pressure air molding stepof the molding method according to the present invention.

FIG. 11 is a section showing vacuum aeration condition of cooling airaccording to the molding method of the present invention.

FIG. 12 is a partly sectional view showing structure of a secondembodiment of the molding apparatus according to the present invention.

FIG. 13 is a section depicting the structure of the molding apparatusaccording to the third embodiment of the present invention.

FIG. 14 is a section showing a setting step of materials according tothe molding method of the present invention.

FIG. 15 is a section showing a pressure air and press molding step ofthe molding method according to the present invention.

FIG. 16 is a section showing a cooling step of the sound absorptionmaterial according to the present invention.

FIG. 17 is a section depicting a second embodiment of the moldingapparatus according to the present invention.

FIG. 18 is a section showing a third embodiment of the molding apparatusaccording to the present invention.

FIG. 19 is a section showing a material setting step on the press moldaccording to the prior art.

FIG. 20 is a section showing a pressing step according to theconventional molding method.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The preferred embodiments of the molding method for a laminated moldedbody and molding apparatus for the body will be described in detail withreference to the accompanying drawings.

As seen in FIG. 1 depicting a structure of the car insulator dashboardmolded by the molding method according to the present invention, theinsulator dashboard 10 consists of a sound insulating material 11 madeof a relatively high density flexible material such as a rubber sheet orvinyl chloride containing an inorganic filler, and a sound absorptionmaterial 12 having a perforated basic material, such as polyurethanefoam and felt having a desired sound absorption function. The soundabsorption material 12 is integrally applied to a rear face of the soundinsulation material 11, resulting in a laminated body that can be usedas a insulator dashboard 10. The shape of the insulator dashboard 10corresponds to that of a dashboard panel 18 facing the car interiorbecause the laminated body of the dashboard 10 is applied and bonded tothe dashboard panel 18.

In addition, it is noted that as will be described, the insulatordashboard 10 is cold-pressed, so that the thermoplastic resin sheet isused as that of the sound insulation material 11 and the thermal-moldingfelt is used as the sound absorbing material 12.

The molding apparatus 19 for molding the insulator dashboard 10 shown inFIG. 1 consists generally of cold pressing molding lower mold 13 andcold-pressing-molding upper mold 14 as shown in FIG. 2.

The cold-pressing-molding lower mold 13 has blowing pressure air holes16 formed thereon and cooling pipes 13 a contained therein. Thecold-pressing-molding upper mold 14 placed above the lower mold 13 hasvacuum suction holes 15 formed thereon and cooling pipes 14 a arrangedtherein. A sealing cylinder 17 is placed around the circumference of theupper mold 14.

An embodiment of a molding method for an insulator dashboard 10 usingthe pressing molding apparatus 19 structured as mentioned above will bedescribed.

First, as shown in FIG. 2, a thermoplastic resin sheet S and athermal-molding felt F, respectively are heated in heating furnaces Aand B, and the thermal-molding felt F and the thermoplastic resin sheetS are placed on the cold-pressing-molding lower mold 13 in the order ofthat above.

Then, the cold-pressing-molding upper mold 14 is lowered in order topress and mold the thermoplastic resin sheet S and the thermal-moldingfelt F by means of cold pressing molding the upper mold 14 and the lowermold 13.

Circulating the cooling medium through cooling pipes 13 a and 14 aarranged within the cold-pressing-molding upper mold 14 and lower mold13, the upper mold and the lower mold are cooled and then thethermoplastic resin sheet S and thermal-molding felt F are cooled. Bymeans of vacuum suction holes 15 formed on the upper mold 14, thethermoplastic resin sheet S comes intimately in contact with a mold faceof the upper mold 14. By means of the pressure air holes 16 formed onthe lower mold 13, cooling air is supplied into the thermal-molding feltF. Thus, the molding process of thermoplastic resin sheet S is assistedand cooling of the thermal-molding felt F is accelerated.

At this time, as shown in FIG. 4, circumference sealing cylinder 17raises the sealing member 17 a resulting in displacement of air from thepressure air holes 16.

Next, the second embodiment of the molding method according to thepresent invention will be described with reference to the drawingsconcerning the the second embodiment.

FIG. 6 depicts structure of molding apparatus related to the secondembodiment the molding method according to the present invention, FIG. 6through FIG. 11 depict the respective steps of the molding method, andFIG. 12 shows the structure of the second embodiment of moldingapparatus according to the present invention.

The molding apparatus 20 adapted to use and mold the insulator dashboard10 shown in FIG. 1 consists in general cold-pressing-molding lower mold30 and cold-pressing-molding upper mold 40 as shown in FIG. 5.

In more detail, the cold-pressing-molding lower mold 30 has blowingpipes 31 arranged so as to protrude their front ends 31 a through moldface 30 a of the lower mold 30. The blowing pipes 31 are connected to apressure air pump 33 through a piping 32 provided with an opening valve34.

Although the blowing pipe 31 can be manufactured from any material, itbe preferable that it is made of stainless steel since stainless steelpipe can be mass-produced. As will be described later, the stainlessblowing pipe 31 enters into the thermal-molding felt F. Thus, it ispreferable that its front end 31 a is be tapered.

Additionally, it is preferable to concentrate the blowing pipes 31 on athick portion of the sound absorbing material 12 of the insulatordashboard 10 considering the cooling efficiency of thermal-molding feltF.

The cold-pressing-molding lower mold 30 has vacuum suction holes 35formed thereon and connected to vacuum suction pumps 37 through vacuumsuction pipes 36. The vacuum suction pipes 36 have an open-and-closevalve 38 and the lower mold 30 has cooling pipes 39 for cooling themold.

The cold pressing molding upper mold 40 placed above the lower mold 30has vacuum suction holes 41 formed thereon and connected to a vacuumsuction pump 43 through vacuum suction pipe 42. The vacuum suction pipe42 has an open-and-close valve 44.

Sealing cylinder 45 is attached to outer peripheral portion of the uppermold 40. A sealing member 46 attached to the sealing cylinder 45 isconnected to the outer peripheral portion of the upper mold 40 so as tomove vertically.

The upper mold 40 has cooling pipes 47 for cooling the upper mold 40.

An embodiment of the molding method for insulator dashboard 10 shown inFIG. 1, which method using the pressing molding apparatus 20 structuredas mentioned above, will be described.

First, a thermoplastic resin sheet S of material for the sound insulatormaterial 11 as shown in FIG. 6, is heated to 130 to 135° C. of itssurface temperature by means of infrared heating furnace 50. As shown inFIG. 7, the thermal-molding felt F is heated by a hot blast heatingfurnace 51 until its inner temperature reaches 165 to 175° C.

Then, as shown in FIG. 8, the thermal-molding felt F and thethermoplastic resin sheet S, respectively heated and softened are set inorder of the above on the mold face of cold-pressing-molding lower mold30.

After respective materials are set, cold-pressing-molding upper mold 40lowers as shown in FIG. 9, and both the thermoplastic resin sheet S andthermal-molding felt F are placed between and pressed by thecold-pressing-molding upper and lower molds 30 and 40, leaving apredetermined clearance.

While pressing of both the upper and lower molds, the blowing pipe 31situated under the lower mold 30 intrudes into the thermal-molding feltF. Because the front end 31 a of the blowing pipe 31 has shape of taper,the thermal-molding felt F doesn't deform and the blowing pipes 31effectively enter into the thermal-molding felt F.

Then, as shown in FIG. 10, the opening valve or open-and-close valve 44opens and the vacuum pump 43 drives, so that the thermoplastic resinsheet S is vacuum-molded in the interior of the upper mold 40.Simultaneously, the opening valve 34 opens in order to supply coolingair from the pressure air pump 33 into the thermal-molding felt Fthrough blowing pipes 31.

Consequently, because the blowing pipes 31 intrude into thethermal-molding felt F at a mid level of its thickness, it is more rapidand easier to circulate cooling air through the interior of thethermal-molding felt F as compared with the first embodiment in whichcooling air is supplied through the lower mold molding face. Inaddition, because pressure air is rapidly applied also to thethermoplastic resin sheet S, it is possible to shorten considerably themolding time necessary for the thermoplastic resin sheet S and coolingtime necessary for the thermal-molding felt F.

The sealing cylinder 45 operates at a timing a little shifted from thatof supply of cooling air from the pressure air pump 33, and the sealmember 46 is raised slightly in order to exhaust cooling air out of thestructure.

As described above, supplying of cooling air from the blowing pipes 31exhaust air, used in pressure air molding of the thermoplastic resinsheet S and the cooling of thermal-molding felt F, through the outerperiphery of the mold. If the vacuum pump 38 operates as shown in FIG.11 to forcibly displace hot air contained in the thermal-molding felt Fthrough the vacuum suction holds 35 formed in the lower mold 30, it ispossible to send more fresh cooling air into the thermal-molding felt F,improving cooling efficiency of the felt F.

Furthermore, as depicted in FIG. 12, a plurality of supplemental holes31 b formed on side face of the blowing pipe 31 and consequently coolingair supplied from the front end 31 a is sprayed from the supplementalholes 31 b in a shape of radiation, improving cooling efficiency of thethermal-molding felt F.

Next, the third embodiment of the molding method according to thepresent invention will be described with reference to the accompanyingdrawings.

As described in FIG. 13 depicting structure of the molding apparatus ofthe third embodiment according to the present invention, thecold-pressing-molding lower mold 130 contains cooling pipes 131 and areceiving seat 132 having an upper V groove 132 a is provided on theouter side of the lower mold 130.

While, the cold-pressing-molding upper mold 140 above the lower mold 130has air pressing function, a plurality of air supply ports 142 areformed within the upper mold 140 in order to down-blow cooling airsupplied from the air supply piping 141 through mold face of the uppermold 140, and wedge type seal member 143 is provided on the outerperiphery of the upper mold 140. In addition, the upper mold 14 isadapted to vertically move by an up-and-down cylinder 144.

In addition, also the upper mold 140 contains cooling pipe (not shown).

With reference to FIG. 14 through FIG. 16, the molding method for theinsulator dashboard 10 shown in FIG. 1 will be described in detail.

First, as shown in FIG. 14, a thermoplastic resin sheet S and athermal-molding felt F of the materials for sound insulation materiallayer 11 and the sound absorption material layer 12 are placed on thecold-pressing-molding lower mold 130.

The thermoplastic resin sheet S and the thermal-molding felt F,respectively have been previously heated and softened, and surfacetemperature of the thermoplastic resin sheet S is 130 to 135° C. andthat of the thermal-molding felt F is 165 to 175° C.

After completing the setting step of materials, elevating cylinder 144operates to lower the cold-pressing-molding upper mold 140. Leavingpredetermined clearance between cold-pressing-molding upper and lowermolds 130 and 140, pressure of 15 to 30 kg/cm² is applied to them,pressing both the thermoplastic resin sheet S and the thermal-moldingfelt F.

In addition of such pressing operation, as shown in an enlarged view ofFIG. 15, seal members 143 provided around the outer periphery of theupper mold 140 sandwich the thermoplastic resin sheet S and thethermal-molding felt F the sealing circumferences of these materials. Asshown in FIG. 15 (as well as in FIGS. 4 and 9), the sealing members 143(17, 46) seal thermal-molding felt and the thermoplastic resin sheet atabout the outer periphery of the lower mold.

Then, keeping such sealed condition of the circumferences of thesematerials, compressed cooling air (pressure: 3 to 5 kg/cm²) is sprayedonto the thermal-molding felt F and thermoplastic resin sheet S from theair supply port 142 formed on the upper mold 140.

As a result, the whole surface of thermoplastic resin sheet S is pressedonto and come contact with the face of the lower mold 130 by pressureair functioned through the thermal-molding felt F. Thus, thethermoplastic resin sheet S can be precisely molded in a shape of thelower mold 130.

After the pressure air pressing step molds the sound insulation materiallayer 11 and the sound absorbing material layer 12 in a desired shape,the upper mold 140 is raised slightly as shown in FIG. 15, and sealedcondition of seal member 143 to break the receiving seat 132 leavingpassage or space through which air escapes to the outside. Cooling airfrom air supply port 142 is blown onto and into the sound absorbingmaterial layer 12 through the air supply piping 141 in order tocompulsorily exhaust heat from the sound absorption material layer 12and sound insulation material layer 11 to the outside together with air.

As described above, the molding method according to the presentinvention consists of a setting step, a pressure air pressing step, anda cooling step, comparing to two pressing steps of the conventionalmolding method. As a result, it is possible to carry out one pressingstep with low pressure without complicated pressure control operation.Additionally, it is possible to considerably shorten cooling cycleperiod advantageously.

Next, the second and the third embodiments of the molding apparatusaccording to the present invention will be described with reference toFIG. 17 and FIG. 18. As shown in particular in FIG. 17, the coldpressing molding lower mold 130 has vacuum suction holes 133 formedthereon so as to function as a vacuum suction tool. When the soundinsulation material layer 11 is pressed and molded by pressure air,vacuum suction functions to more shorten cooling cycle period expandingadvantageously moldability of the sound insulator material layer 11.

As shown in FIG. 18a, trimming blade 145, in place of the wedge typeseal member 143 of the first embodiment of the molding method, isprovided on the outer periphery of the upper mold 140 as well as asealing striper 134 provided on outer peripheral face of the lower mold130 through a spring 135 so that after the sound suction material layer12 is cooled, the upper mold 140 again lowers to trim the outerperipheral portion, easing trimming operation and piecing operation ofthe next step.

As described above, according to the molding method of the laminatedmolded body of the present invention, cooling air is supplied into thethermal-molding felt through pressure air holes or ports provided on thecold-pressing-molding lower mold in order to assist molding of thethermoplastic resin sheet and accelerate cooling of the thermal-moldingfelt.

The molding method of the laminated molded body of the present inventioncan make the sound insulation material come to in intimate contact withthe face of the upper mold by means of vacuum suction holes formed onthe upper mold.

Additionally, according to the molding method of the laminated moldedbody of the present invention, cooling air is supplied from a blowingpipe so as to make its front end protrude from the face of the lowermold to a thermal-molding felt, resulting in cooling air being suppliedto a central portion of the felt. Thus, by cooling time for thethermal-molding felt is considerably shortened and molding of athermoplastic resin sheet is accelerated. Consequently, the wholeoperation of molding is shorten very much.

Also, according to the molding method for laminated molded body of thepresent invention, air supplied into the thermal-molding felt throughthe blowing pipe intruded into the felt is recovered from not only theouter periphery of the felt but also through the vacuum suction holesformed on the lower mold advantageously further shorteningthermal-molding felt.

According to the molding method of the present invention, thecold-pressing-molding upper mold is raised slightly after the molding iscompleted to break the sealing condition of the outer periphery of theupper and the lower molds and and cooling air is sent into the soundabsorbing material layer through air supply ports or holes, therebyconsiderably shortening the cooling cycle time can and the molding time.

According to the molding apparatus of the laminated molded body of thepresent invention, the cold-pressing-molding lower mold has pressure airholes for accelerating cooling of the thermal-molding felt in order tosupply cooling air into the thermal-molding felt through the pressureair holes and to accelerate cooling of the thermal-molding felt.

Also, the molding apparatus for laminated molded bodies has an uppermold provided with vacuum suction holes for vacuum-molding thethermoplastic resin sheet the sound insulation material intimately comesinto vacuum-contact with face of the upper mold, assisting molding ofthe thermal-molding resin sheet.

According to molding apparatus for laminated molded bodies of thepresent invention, the blowing pipe is situated on the lower mold so asto make a front end of the pipe protrude from molding face of the lowermold and to supply cooling air into the thermal-molding felt.Consequently cooling air is supplied to the central portion of thethermal-molding felt, the cooling time of the thermal-molding felt isexceedingly shortened, molding of the thermoplastic resin sheet isassisted, and the whole molding time is shortened very much.

In accordance with the molding apparatus for laminated molded bodies,air supplied to the thermal-molding felt through the blowing pipeintruded or inserted into the interior of the felt is exchausted throughthe vacuum suction holes formed on the lower mold so that cooling timeof thermal-molding felt is further shortened.

According to the molding apparatus for laminated molded bodies of thepresent invention, a plurality of assistant holes are formed on the sideof the blowing pipe in order to forcibly cool the thermal-molding felt,resulting in high cooling efficiency of thermal-molding felt.

In addition, the molding apparatus of the present invention has trimmingblade having functions of sealing, trimming, and cutting. The trimming,which blade is provided on outer periphery of cold-pressing-moldingupper mold, simplifying the whole mold installation and loweringmanufacturing and installation costs.

The preferred embodiments of the present invention have been describedand it is understood that other embodiments and modifications can bemade within the scope and sprit of the present invention.

What is claimed is:
 1. A molding apparatus for a laminated molded bodythat includes a thermal-molding felt and a thermoplastic resin sheet,comprising: a cold-pressing-molding lower mold provided with apredetermined mold face; and a cold-pressing-molding upper mold placedabove said lower mold in order to press and mold the thermal-moldingfelt in a predetermined shape, while providing a predetermined clearancebetween the upper and lower molds, wherein the upper mold carries amovable sealing member for sealing the thermal-molding felt and thethermoplastic sheet at about the outer periphery of the lower mold, themovable sealing member being movable relative to the upper mold whilemaintaining the same predetermined clearance between the upper and lowermolds to break the seal and permit air to escape through a portion ofthe thermal-molding felt extending to about or beyond the outerperiphery of the lower mold to exhaust heat, and wherein one of thelower and upper molds has pressure air holes for delivering cooling andaccelerating cooling of the thermal-molding felt, the one of the lowerand upper molds having the pressure air holes is adapted to contact thethermal-molding felt so that the cooling air introduced through thepressure air holes penetrates into and through the thermal-molding feltto the thermoplastic resin sheet to force the thermoplastic resin sheetagainst the other of the lower and upper molds to more precisely moldthe thermoplastic resin sheet against the other of the lower and uppermolds.
 2. The molding apparatus for a laminated body according to claim1, wherein the other of the lower and upper molds has vacuum suctionholes for vacuum-molding said thermoplastic resin sheet to even moreprecisely mold the thermoplastic resin sheet.
 3. The molding apparatusfor a laminated body according to claim 1, wherein the one of the lowerand upper molds has a blowing pipe extending from a mold face thereofand is adapted to penetrate into the thermal-molding felt when thelaminated molded body is pressed.
 4. The molding apparatus for alaminated body according to claim 3, wherein said blowing pipe includesa plurality of supplemental or assisting holes for forcibly cooling thethermal-molding felt.
 5. The molding apparatus for a laminated bodyaccording to claim 3, wherein the other of the lower and upper molds hasa plurality of vacuum suction holes for exhausting air supplied from theblowing pipe.
 6. The molding apparatus for a laminated molded bodyaccording to claim 5, wherein said blowing pipe includes a plurality ofsupplemental or assisting holes for forcibly cooling the thermal-moldingfelt.
 7. The molding apparatus for a laminated body according to claim1, further including an air pump for providing pressurized air to thepressure air holes.